Controlled Nanoscale Morphology of Hematite (0001) Surfaces Grown by Chemical Vapor Transport

Authors

  • M. E. Greene,

    1. Department of Materials Science and Engineering, and the Institute for Environmental Catalysis, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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  • A. N. Chiaramonti,

    1. Department of Materials Science and Engineering, and the Institute for Environmental Catalysis, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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  • S. T. Christensen,

    1. Department of Materials Science and Engineering, and the Institute for Environmental Catalysis, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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  • L. X. Cao,

    1. Department of Materials Science and Engineering, and the Institute for Environmental Catalysis, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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  • M. J. Bedzyk,

    1. Department of Materials Science and Engineering, and the Institute for Environmental Catalysis, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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  • M. C. Hersam

    1. Department of Materials Science and Engineering, and the Institute for Environmental Catalysis, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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  • We thank Prof. Mikio Takano of the Institute for Chemical Research at Kyoto University for supplying the CVT-grown hematite samples. In addition, we acknowledge informative discussions with Prof. Kenneth Poeppelmeier, Prof. Peter Stair, Prof. Laurence Marks, and Prof. Mark Asta at Northwestern University. This work was supported by the Department of Energy Institute for Environmental Catalysis, under Grant Number DE-FG02-03ER15457, and used Northwestern University MRSEC central facilities (NSF DMR-0076097).

Abstract

original image

Stable α-Fe2O3 surfaces: A 3D rendering of the controlled nanoscale morphology observed on a hematite (0001) surface is shown in the Figure. This atomically flat surface is characterized by circular depressions with diameters on the order of hundreds of nanometers and depths of 2.2 ± 0.2 Å. At room temperature, the surface is exceptionally stable, with no measured change following storage in air over several months.

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